Tektronix 222 Operator's Manual page 141

Checking Performance-222 DSO Operators
NOTE
The Variable knob must be held in as it is rotated or it
reverts to its Vertical POSITION function.
f. Set the CH 2 Variable VOLTSIDIV to CAL (press and hold in the
Vertical POSITION knob and rotate it cw until an audible beep is
heard and the uncal indicator is cleared from in front of the VOLTSIDIV
readout).
g. SET: CH 2 Coupling CH2 OFF
CH 1 Coupling DC
CH 1 VOLTSIDIV 50 mV
h. Disconnect the Channel 2 probe tip from the test equipment
and connect the Channel
1
probe tip.
i. Repeat parts c, d, e, and f for CH 1
5.
Check VOLTSIDIV Accuracy
a. Set the CH 1 VOLTSIDIV to 5 mV.
b. Set Calibration Generator for a standard-amplitude output sig-
nal of 20 mv.
c. Vertically center the display.
d. CHECK-all positions of the VOLTSIDIV settings for correct
signal-to-graticule accuracy using the VOLTSIDIV and Calibration
Generator settings and Amplitude Limits given in Table A-2.
e. Return the Calibration Generator output to 20 mV.
f. SET: CH
1
Coupling CHI OFF
CH 2 Coupling DC
CH
2
VOLTSIDIV
5
mV
g. Disconnect the Channel
1
probe tip from the test equipment
and connect the Channel 2 probe tip.
h. Repeat part d for CH 2.
i. Disconnect the test equipment from the oscilloscope and
return the Calibration Generator output to 20 mV.
REV MAR 1989
A-1 1